✨ Terminal Utility: Tabs & Split View

### Describe the solution you'd like

Being able to have more than one shell in a project would be great.

**Please note the following behaviors:**
- The plus icon adds a new terminal tab (not in a group).
- The minus button closes the selected tab.
- Press the delete key while terminal tab sidebar is in focus to close the selected tab.
- Drag an ungrouped terminal tab on top of another ungrouped terminal tab to create a group.
- Drag an ungrouped terminal tab into an existing group to add it to that group.
- Drag a terminal tab within a group to reorder it.
- Drag a grouped terminal tab to another group to move it to another group.

### Describe alternatives you've considered

Here are some examples of how it handles Webstorm:

https://user-images.githubusercontent.com/806104/161374050-7e8cc0b5-e731-49a3-a7de-6fd41328adea.mp4

### Additional context

### Depends on
- #350